I love layering gray on gray. It can be such an elegant look, but just as casual. Sorry for the over-use of my Sears cardigans, but I don't have many long sleeves [which is a problem for someone who has lived in the Midwest her whole life] and I tend to over-wear clothes after I just purchase them. Something I have discovered this winter is socks! Wear knee highs with jeans. no one will even know and you will stay toasty.